Darrell Hammond, the 12-year vet of “Saturday Night Live” known for his Bill Clinton impression, is barely able to work after a recent Hamptons car crash, according to his lawyer. “[Darrell] suffered fractured ribs and a severe lower back injury,” attorney Melanie Little, who filed a Manhattan lawsuit on Hammond’s behalf yesterday, told The Post’s Laura Italiano. According to Little, Hammond, a stand-up comic, now can’t stand up for lengthy periods. “It affects his ability to perform,” she said. “He’s in pain and had to cancel many performances. He can’t fly and he can’t stand up.” Hammond canceled the two final performances of his one-man play, “Tru,” at the Bay Street Theater in Sag Harbor. He’s also had to cut short performances at Caroline’s, Little said. The suit seeks unspecified compensation from the driver of the other car and a buddy who was driving Hammond’s car.